[Qemu-devel] [PATCH v2] xhci: check speed field of the input context of a set address command.

[Sebastian Bauer <mail@sebastianbauer.info>]

If the supplied speed data doesn't match the device speed,
return CC_PARAMETER_ERROR. See 6.2.2.1 of the xhci spec.

Signed-off-by: Sebastian Bauer <mail@sebastianbauer.info>
---
Changes v1->v2: Added description to the patch

 hw/usb/hcd-xhci.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 37b3dbb..32a3681 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -1822,6 +1822,7 @@ static TRBCCode xhci_address_slot(XHCIState *xhci, unsigned int slotid,
     uint32_t ictl_ctx[2];
     uint32_t slot_ctx[4];
     uint32_t ep0_ctx[5];
+    uint32_t speed;
     int i;
     TRBCCode res;
 
@@ -1865,6 +1866,15 @@ static TRBCCode xhci_address_slot(XHCIState *xhci, unsigned int slotid,
         return CC_USB_TRANSACTION_ERROR;
     }
 
+    /* Check for validness of the input contexts, see 6.2.2.1 */
+    speed = (slot_ctx[0] >> 20) & 0xf;
+    if (speed != uport->dev->speed + 1)
+    {
+        fprintf(stderr,"xhci: invalid device speed in slot context for slot %u (expected %d, got %d).\n",
+                slotid, uport->dev->speed+1, speed);
+        return CC_PARAMETER_ERROR;
+    }
+
     for (i = 0; i < MAXSLOTS; i++) {
         if (xhci->slots[i].uport == uport) {
             fprintf(stderr, "xhci: port %s already assigned to slot %d\n",
-- 
1.7.10.4